The information on how to operate the AP can be found in the ‘B-52 Driver’ FLIGHT MANUAL Part II – Aircraft and Systems (csb521_manual2.pdf).Read the information under the headings P03. AUTOPILOT TURN AND PITCH CONTROLLER (page 45), P04. AUTOPILOT COMMAND SELECTOR PANEL (page 46), and P18. NAVIGATION SYSTEM SELECT PANEL (page 47).